73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 110
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73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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mode in which the card is operating. When T=1 these registers are used to configure the CWT and these
registers configure the IWT when the ATR is being received. These registers should be loaded prior to
receiving characters from the smart card. Firmware must manage which time is stored in the register. If
a timeout occurs, an interrupt is generated to the firmware. The firmware can then take appropriate
action.
Block Wait Time Registers (BWTB0): 0xFE1B
0xFE19
These registers (BWTB0, BWTB1, BWTB2, BWTB3) are used to set the Block Waiting Time(27:0)
(BWT). All of these parameters define the maximum time the 73S1217F will have to wait for a character
from the smart card. These registers serve a dual purpose. When T=1, these registers are used to set
up the block wait time. The block wait time defines the time in ETUs between the beginning of the last
character sent to smart card and the start bit of the first character received from smart card. It can be
used to detect an unresponsive card and should be loaded by firmware prior to writing the last TX byte.
When T = 0, these registers are used to set up the work wait time. The work wait time is defined as the
time between the leading edge of two consecutive characters being sent to or from the card. If a timeout
occurs, an interrupt is generated to the firmware. The firmware can then take appropriate action. A Wait
Time Extension (WTX) is supported with the 28-bit BWT.
Character Wait Time Registers (CWTB0): 0xFE1D
These registers (CWTB0, CWTB1) are used to hold the Character Wait Time(15:0) (CWT) or Initial
Waiting Time(15:0) (IWT) depending on the situation. Both the IWT and the CWT measure the time in
ETUs between the leading edge of the start of the current character received from the smart card and the
leading edge of the start of the next character received from the smart card. The only difference is the
110
MSB
MSB
MSB
MSB
MSB
MSB
CWT.15
BWT.15
BWT.23
CWT.7
BWT.7
0x00, (BWTB3): 0xFE18
–
CWT.14
BWT.14
BWT.22
BWT.6
CWT.6
–
BWT.13
BWT.21
CWT.13
BWT.5
CWT.5
Table 104: The BWTB0 Register
Table 106: The BWTB2 Register
Table 107: The BWTB3 Register
Table 108: The CWTB0 Register
Table 109: The CWTB1 Register
–
Table 105: The BWTB1 Register
0x00
CWT.12
BWT.12
BWT.20
CWT.4
BWT.4
–
0x00, (BWTB1): 0xFE1A
CWT.11
BWT.11
BWT.19
BWT.27
CWT.3
BWT.3
0x00, (CWTB1): 0xFE1C
BWT.10
BWT.18
BWT.26
CWT.10
BWT.1
CWT.1
BWT.17
BWT.25
BWT.2
BWT.9
CWT.2
CWT.9
0x00, (BWTB2):
0x00
BWT.16
BWT.24
CWT.0
CWT.8
BWT.0
BWT.8
LSB
LSB
LSB
LSB
LSB
LSB
Rev. 1.2
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